Daniel Zohary, Uzi Nur, Natural Triploids in the Orchard Grass, Dactylis glomerata L., Polyploid Complex and Their Significance for Gene Flow From Diploid to Tetraploid Levels, Evolution, Vol. 13, No. 3 (Sep., 1959), pp. 311-317
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Zohary et al. (1959) studied this question.